Imaging Fluorescence of He2 Excimers Created by Neutron Capture in Liquid Helium II

We show unequivocal evidence for formation of He2* excimers in liquid He II created by ionizing radiation produced through neutron capture. Laser beams induce fluorescence of the excimers. The fluorescence is recorded at a rate of 55.6 Hz by a camera. The location of the fluorescence is determined w...

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Bibliographic Details
Published in:Physical review letters 2020-04, Vol.124 (13), p.1
Main Authors: Wen, X, Bao, S R, McDonald, L, Pierce, J, Greene, G L, Crow, Lowell, Tong, Xin, Mezzacappa, A, Glasby, R, Guo, W, Fitzsimmons, M R
Format: Article
Language:English
Subjects:
Excimers
Fluid dynamics
Fluorescence
Helium isotopes
Ionizing radiation
Laser beams
Liquid helium
Nuclear capture
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Summary:We show unequivocal evidence for formation of He2* excimers in liquid He II created by ionizing radiation produced through neutron capture. Laser beams induce fluorescence of the excimers. The fluorescence is recorded at a rate of 55.6 Hz by a camera. The location of the fluorescence is determined with an uncertainty of 5  μm. The technique provides an opportunity to record the flow of He2* excimers in a medium with very small viscosity and enables measurement of turbulence around macroscopic liter size objects or vortex matter in three dimensions.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.134502